Output
User-adjusted audio offset, milliseconds
UserBenchmark / All Tools / Lip Sync Test
Audio
Lip Sync Test
Compare a timed visual marker and click sound with an adjustable offset.
Free to useNo downloadNo sign-up
Lip Sync Test · At a glance
Quick answer: Compare a timed visual marker and click sound with an adjustable offset. Positive offset schedules sound later.
Lip Sync Test
The test loads when you open it. Device access is requested only after you choose to start.
Detailed guide
How to use this tool
- Start the pulse and click, then adjust offset while comparing perceived alignment.
- Use your normal display and audio route.
Input
Visual pulse and quiet click comparison
Browser requirement
Web Audio scheduling; animation timing
Processing
Runs on your device; no tool-result upload
How it works and what the result means
Positive offset schedules the sound later. The check is subjective and includes browser, display and audio pipeline behavior.
Reading the result
Positive offset schedules sound later. The physical light and sound output can still be delayed differently by the hardware chain.
What to check next
Keep picture mode fixed and stop before changing output devices. Repeat rather than relying on one impression.
Stop before changing devices. A scheduled simultaneous cue is not a guarantee of simultaneous physical light and sound output.
Frequently asked questions
Does the offset change video playback in other apps?
No. It changes only the scheduled cue inside this page. Apply any intended compensation separately in the actual player or device.
How do I start the Lip Sync Test?
Start the synchronized visual pulse and click, then adjust the audio offset in milliseconds.
Does this tool require a download or an account?
No. Open the interactive tool above in a modern browser. The instructions and explanations are available even with JavaScript disabled; running a test needs JavaScript.
Why can two attempts give different results?
Power settings, background tasks, browser scheduling, operating-system input processing and device settings affect measurements. Compare repeated attempts with identical settings rather than the single highest score.